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Main Relay (Computer/Fuel System): Testing and Inspection
Power Relay Test
Use this chart to identify the type of relay, then do the test listed for it.
NOTE:
- For the turn signal/hazard relay input test, refer to Lighting and Horns.
- PGM-FI main relay 2 contains a diode between No. 3 and No. 4 terminals. Power (+B) must be connected to the No. 4 terminal, and ground connected to the No. 3 terminal. Failure to test relay correctly will damage the relay and the PCM.
Normally-open type
Check for continuity between the terminals.
- There should be continuity between the No. 1 and No. 2 terminals when battery positive terminal is connected to the No. 4 terminal, and battery negative terminal is connected to the No. 3 terminal.
- There should be no continuity between the No. 1 and No. 2 terminals when power is disconnected.